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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="./OL_SDK/include-openlayers-local.js"></script>
  <script src="./libs/gaode.js"></script>
</head>

<body>
  <div id="map">
  </div>
  <script>
    var map = new ol.Map({
      target: "map",
      layers: [gaode],
      view: new ol.View({
        projection: 'EPSG:4326',
        center: [114.30, 30.50],
        zoom: 4
      })
    })
    /* 1、创建画布 */
    const source = new ol.source.Vector({

    })
    const layer = new ol.layer.Vector({
      source
    })
    map.addLayer(layer)
    /* 2、创建画笔 */
    let draw = new ol.interaction.Draw({
      type: "Polygon",
      source
    })
    /* 3、激活画笔 */
    map.addInteraction(draw)
    /* Square,Box */
  </script>
</body>

</html>